Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add dembrandt/dembrandt-skills --skill sizing-unitsgit clone --depth 1 https://github.com/dembrandt/dembrandt-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/dembrandt/dembrandt-skills/sizing-units)<a href="https://agentmods.dev/skills/dembrandt/dembrandt-skills/sizing-units"><img src="https://agentmods.dev/badge/skills/dembrandt/dembrandt-skills/sizing-units/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/dembrandt/dembrandt-skills/sizing-units"><img src="https://agentmods.dev/badge/skills/dembrandt/dembrandt-skills/sizing-units.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00091 | $0.01465 |
| Opus 5 | $0.00046 | $0.00732 |
| Sonnet 5 | $0.00018 | $0.00293 |
| Haiku 4.5 | $0.00009 | $0.00146 |
Grade A, and why
sizing-units scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sizing Units
The Question the Unit Answers
A unit is not a formatting preference. It is a declaration of what happens to a value when the user enlarges text.
rem— this value belongs to the text and must grow with it.px— this value belongs to the screen and must stay put.%,fr,ch,clamp(),min()— this value belongs to the available space.
Pick the unit by answering that question, not by picking a house style and applying it everywhere. Both absolutist positions — all-rem and all-px — produce defects, and they are different defects.
Zoom Is Not the Font-Size Setting
The common argument for px everywhere is that browsers already have full-page zoom, so the root font size can be ignored. They are separate controls serving separate people.
- Full-page zoom magnifies everything, layout included. It buys larger text at the cost of horizontal scrolling and fewer items per screen.
- The browser's default font size enlarges text and leaves the layout alone. This is what a user with low vision sets once, years ago, and never touches again. They will not switch to zoom because your product ignored it.
A product that hard-codes every dimension in px answers the first user and silently refuses the second. WCAG 2.2 SC 1.4.4 (Resize Text) requires text to reach 200% without loss of content or function, and SC 1.4.10 (Reflow) requires the page to survive it in a single column. See [[wcag-accessibility]].
Use rem For
Typography. Every font size and line height. See [[modular-scale-typography]].
Padding around text. A button's inner padding in px means large text presses against its edges. In rem the breathing room scales with the words it surrounds.
Control heights. A 40px control holding 24px text is broken. Write the height token in rem and it stays a control-shaped control at every text size. See [[component-family-consistency]].
Measure. max-width on a text column: 65ch or a rem value, never px.
Gaps between text-bearing blocks. Stack spacing in a form or an article is part of the reading rhythm.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 7d ago First seen · 129 lines · 91 tokens per session scan A be073de5c438
sizing-units is a skill published in the GitHub repository dembrandt/dembrandt-skills (54 stars, last pushed yesterday), licensed MIT. It adds 91 tokens to every session and 1,465 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-05.
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